CASCACascade Atlas

Evidence dossier

CVE-2026-21514

Microsoft Word Security Feature Bypass Vulnerability

62.0–77.0Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

Reliance on untrusted inputs in a security decision in Microsoft Office Word allows an unauthorized attacker to bypass a security feature locally.

State
PUBLISHED
Published
Feb 10, 2026
Updated
May 11, 2026
Evidence coverage
85%
CISA KEVCatalog member

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

FIRST EPSS1.52%

2026-07-18 · v2026.06.15 · percentile 71.7%

Source stateNo scored conflict

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

microsoftoriginal assertion
container

Microsoft Word Security Feature Bypass Vulnerability

CISA KEVoriginal assertion
observed_exploitation

Microsoft Office Word Reliance on Untrusted Inputs in a Security Decision Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.015170000000; percentile 0.717230000000

Applicability

Cited product scope

Trace impact →
MicrosoftMicrosoft 365 Apps for Enterprise
[{"status": "affected", "version": "16.0.1", "lessThan": "https://aka.ms/OfficeSecurityReleases", "versionType": "custom"}]unknown
MicrosoftMicrosoft Office LTSC 2021
[{"status": "affected", "version": "16.0.1", "lessThan": "https://aka.ms/OfficeSecurityReleases", "versionType": "custom"}]unknown
MicrosoftMicrosoft Office LTSC 2024
[{"status": "affected", "version": "16.0.0", "lessThan": "https://aka.ms/OfficeSecurityReleases", "versionType": "custom"}]unknown
MicrosoftMicrosoft Office LTSC for Mac 2021
[{"status": "affected", "version": "16.0.1", "lessThan": "16.106.26020821", "versionType": "custom"}]unknown
MicrosoftMicrosoft Office LTSC for Mac 2024
[{"status": "affected", "version": "16.0.0", "lessThan": "16.106.26020821", "versionType": "custom"}]unknown
Unknown vendorUnknown product
cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*supported
Unknown vendorUnknown product
cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:*supported
Unknown vendorUnknown product
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:macos:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x64:*supported
Unknown vendorUnknown product
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x86:*supported
Unknown vendorUnknown product
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:macos:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:-:x64:*supported
Unknown vendorUnknown product
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:-:x86:*supported

Assessments

CVSS by origin

7.8
secure@microsoft.comCVSS 3.1 · role SecondaryCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8
microsoftCVSS 3.1 · role unknownCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

Limitations and unknowns

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.